The technique as well as the analytical procedures for modeling the excavation processes were coded in a computer program and the accuracy of the program was evaluated. In order to minimize the number of elements and nodes without sacrificing the precision of the analysis, a series of convergence studies were carried out, which makes the three-dimensional analysis feasible from a computational and economic point of view. The effect of the existence of the corner on the deflection behavior of an excavation was studied in detail by analyzing a typical excavation with a medium clayey soil layer. By performing a series of parametric studies, a tentative relationship is developed to estimate the maximum deflection of the three-dimensional wall of an excavation based on two-dimensional finite element results. Finally, the case of an irregularly shaped excavation with field deflection measurements of the wall was studied.